Stone saw



March 13, 1928.

1,662,488 O. BURKHARDT STONE SAW Filed July l5.l 1923 Il l. dll

-m mm Patented Mar. 13, 1928.

UNITED STATE-.s PATENT oFF1CE-j i. OTTO BURKHARDT, OF BAYREUTH, GERMANY.

STONE 'SAW'.

application iiiediuiy 13, 192s, sei-iai No. 651,424, .main Germany May ze, 192.5. i

This invention relates to al stone Saw the cutting tool of which consists of several juxtaposed endless wire ropes. f

Stone saws having' several wire ropes 5 arranged the one at the side of the other to cut successively several works are known per se. From stone saws of thistype the stone saw improved according to this invention differs in that every wire rope is l0 stretched for itself and the cutting side of each endless wire rope is held between the several works by guide pulleys adapted to be adjusted in vertical direction. If every endless wire rope is not stretched for itself The invention will be best understood from a consideration of the following detailed description taken in connection with, the accompanying drawing forming part of this specification, with the understanding that while on the drawings one embodiment of the invention is diagrammatically shown, the invention is not confined to any strict conformity with the showing of the drawings, but may be embodied in any manner which does not make a material departure from the salient features of the invention.

An embodiment of the invention is shown,

by way of example, in the accompanying drawing in which: Y

Fig. 1 shows the improved stone saw in side elevation, partly broken away.

Fig. 2 is a top plan view of Fig. 1.

Fig. 2L shows in elevation the end of the cable loaded with heavy masses.

Fig. 3 shows a portion of the cable.

Each endless wire rope 1 is guided over sixteen guide pulleys 2-17 of which ten are shown. The guide pulleys 2, 3 are arranged the one above the other in a carriage 18 mounted upon a stationary column 19 so that it may be displaced in vertical direc# it is impossible to ensure a uniform stretchtion The guide pulley 3` may however be mounted also stationary or so that it'may be displaced independently of the pulley 2.

The guide pulley 4 is mounted in a carriage 2() which is arranged on a stationary column 21 so that it may be displaced rinv vertical directionl f The endlesswire rope 1 starts from the guide pulley 4 over the guide pulley' 5 to the guide pulley (i which is mounted in a carriage 22lmovable in vertical direction on the column23." The guide pulley() is mountedon alongitudinal beam 24 fixed to the two stationary columns 21 and 23. The endless wire rope 1 is further guided over theA guide pulleys 13 and 14 and pulleys not shown arranged similarly to 4, 5 and (i.r The guide pulley 13 is mounted in a similar 4 manner as the guide pulleys 2, 4 and 6 in a carriage adapted to be displaced in vertical direction, the mounting of the guide pulley 14 being similar to that of guide pulleys 3 and 5., From the guide pulley 14 the wire* rope 1 is conducted over the guide pulley 15 to which a counterweight 25 (one for each rope) is attached and which serves as a stretching` device, said Wirerope going from the guide pulley 15 over the guide pulleys 16 and 17 back to the pulley 3.

For each of the juxtaposed endless wire ropes a set of guide pulleys 2 to 17 is arranged. The drive is transmitted from any convenient source of energy by a belt 26 and belt pulley 27 to a shaft 28'on which all the pulleys 2 are keyed the one at the side `of the other. The pulleys 4., 6 and 13 are also mounted kon common shafts, on which they may be keyed or loosely mounted so as to rotate independently of one anther. The other guide pulleys are revoluble independently' from one another.

The vertical displacement of the carriages is controlled by the same sourcev energy by means of a belt 29 and belt pulley 30. The shaft 31 of the belt pulley operates through the intermediary of abevel wheel lgear 32 two shafts 33.34 standing perpendicular to said shaft 31, the shaft 33 driv-` `ing through a bevel pinion 35 a shaft 36 and the shaft 34 driving by a bevel pinion 37 a (iti and Si other shafts are arranged which operate each through the intermediary 0f bevel wheel gears transverse shafts designed to control the vertical displacement of the other carriages.

Between the guide pulleys 2 and 4, (3 and il and between the similar set of pulleys not shown the working pieces 39, 40, 42 are arranged. Each endless wire rope l cuts therefore between the guide pulleys inentioned, each work being eut by the juxtaposed wire ropes. lVith the stone saw aeeording lo the invention a great amount of work can be executed. The adjusting of the wire ropes in zierordanee with the progress ol the sawing is ell'eel'ed by displacement of the guide pulleys l. 6` and l?, mounted in rarriae'es adjustable in vertical directions, the adjusting being ell'eeted through the inlerniediruiv of the above described drive and of the stretching weight. The. stone saw may however be Constructed in such a manner that only a single work or more than `i'our works at a lilne can be vul b r the juxtaposed wire ropes.

I elann :u

A stone saw comprising in combination several wire ropes arranged the one at the side ot' the others, a supporting 'frame vfor these wire ropes said supporting frame eoinprising a nuinber of successive workingr points for eaeh rope, a set of guide pulleys in ironl oi each working point', and a set of guide pulleys behind each working point, the lower pulley of eaeh set of pulleys serving to guide they cutting side of the wire, rope with regard to the work and the upper guide pulle)Y ol each set oil pulleys serving to conduct lhe wire rope 'from the one eulting plane iulo lhe next followingr vulling plane` and means for stretching each wire rope independently of the other wire ropes,

ln testin'lony whereole I aiix my signature.

OTTO B URK llA RD'l. 

